R4 Ballot #1 (Mixed Normative/Trial use)

This page is part of the FHIR Specification (v3.3.0: R4 Ballot 2). The current version which supercedes this version is 5.0.0. For a full list of available versions, see the Directory of published versions . Page versions: R5 R4B R4 R3

Triggerdefinition.profile.xml

Modeling and Methodology Work GroupMaturity Level: N/ABallot Status: Informative

Raw XML (canonical form)

StructureDefinition for TriggerDefinition

<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="TriggerDefinition"/> 
  <text> 
    <status value="generated"/> 
    <div xmlns="http://www.w3.org/1999/xhtml">
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          <th class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="formats.html#table" title="The logical name of the element">Name</a> 
          </th> 
          <th class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="formats.html#table" title="Information about the use of the element">Flags</a> 
          </th> 
          <th class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="formats.html#table" title="Minimum and Maximum # of times the the element can appear in the instance">Card.</a> 
          </th> 
          <th class="hierarchy" style="width: 100px">
            <a href="formats.html#table" title="Reference to the type of the element">Type</a> 
          </th> 
          <th class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="formats.html#table" title="Additional information about the element">Description &amp; Constraints</a> 
            <span style="float: right">
              <a href="formats.html#table" title="Legend for this format">
                <img alt="doco" src="help16.png" style="background-color: inherit"/> 
              </a> 
            </span> 
          </th> 
        </tr> 
        <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white;">
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
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            <a href="metadatatypes-definitions.html#TriggerDefinition" title="TriggerDefinition : A description of a triggering event. Triggering events can be named
             events, data events, or periodic, as determined by the type element.">TriggerDefinition</a> 
            <a name="TriggerDefinition"> </a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; background-color: white" title="This element is included in summaries">Σ</a> 
            <a href="conformance-rules.html#constraints" style="padding-left: 3px; padding-right: 3px; color: black; background-color: white" title="This element has or is affected by some invariants">I</a> 
            <a href="versions.html#std-process" style="padding-left: 3px; padding-right: 3px; border: 1px grey solid; font-weight: bold; color:
             black; background-color: #fff5e6" title="Ballot Status = Trial Use">TU</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px"/> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="element.html">Element</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">Defines an expected trigger for a module
            <br/>  
            <span style="font-style: italic" title="trd-2">+ A condition only if there is a data requirement</span> 
            <br/>  
            <span style="font-style: italic" title="trd-1">+ Either timing, or a data requirement, but not both</span> 
            <br/>  Elements defined in Ancestors: 
            <a href="element.html#Element" title="Unique id for the element within a resource (for internal references). This may be any
             string value that does not contain spaces.">id</a> , 
            <a href="element.html#Element" title="May be used to represent additional information that is not part of the basic definition
             of the element. To make the use of extensions safe and manageable, there is a strict set
             of governance  applied to the definition and use of extensions. Though any implementer
             can define an extension, there is a set of requirements that SHALL be met as part of the
             definition of the extension.">extension</a> 
          </td> 
        </tr> 

        <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white;">
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
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            8MUggvnH/EOVJjAW4AuQHJ+O75LYqikXE0LzAAALePEntTkEoSAAAAAElFTkSuQmCC" style="background-color: white; background-color: inherit" title="Primitive Data Type"/>  
            <a href="metadatatypes-definitions.html#TriggerDefinition.type" title="TriggerDefinition.type : The type of triggering event.">type</a> 
            <a name="TriggerDefinition.type"> </a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; background-color: white" title="This element is included in summaries">Σ</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">1..1</td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="datatypes.html#code">code</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">named-event | periodic | data-changed | data-added | data-modified | data-removed | data-accessed
             | data-access-ended
            <br/>  
            <a href="valueset-trigger-type.html" title="The type of trigger">TriggerType</a>  (
            <a href="terminologies.html#required" title="To be conformant, the concept in this element SHALL be from the specified value set">Required</a> )
          </td> 
        </tr> 

        <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white;">
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            <a href="metadatatypes-definitions.html#TriggerDefinition.name" title="TriggerDefinition.name : A formal name for the event. This may be an absolute URI that
             identifies the event formally (e.g. from a trigger registry), or a simple relative URI
             that identifies the event in a local context.">name</a> 
            <a name="TriggerDefinition.name"> </a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; background-color: white" title="This element is included in summaries">Σ</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">0..1</td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="datatypes.html#string">string</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">Name or URI that identifies the event</td> 
        </tr> 

        <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white;">
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
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            <img alt="." class="hierarchy" src="data: image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAWCAYAAAABxvaqAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB
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            <a href="metadatatypes-definitions.html#TriggerDefinition.timing_x_" title="TriggerDefinition.timing[x] : The timing of the event (if this is a periodic trigger).">timing[x]</a> 
            <a name="TriggerDefinition.timing_x_"> </a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; background-color: white" title="This element is included in summaries">Σ</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">0..1</td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px"/> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">Timing of the event</td> 
        </tr> 

        <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white;">
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
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            FgY9loiRA4dToTYnsOxg8CBGHE6ICvEYQ4AKzkidfgoKBAA7" style="background-color: white; background-color: inherit" title="Data Type"/>  
            <span title="Specifies an event that may occur multiple times. Timing schedules are used to record
             when things are planned, expected or requested to occur. The most common usage is in dosage
             instructions for medications. They are also used when planning care of various kinds,
             and may be used for reporting the schedule to which past regular activities were carried
             out.">timingTiming</span> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px"/> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px"/> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="datatypes.html#Timing">Timing</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px"/> 
        </tr> 

        <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white;">
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            KlQpU3uPjAwhX2CCcGsgOAAAAAElFTkSuQmCC" style="background-color: white; background-color: inherit" title="Reference to another Resource"/>  timingReference
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px"/> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px"/> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
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            <a href="references.html">Reference</a> (
            <a href="schedule.html">Schedule</a> )
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px"/> 
        </tr> 

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            <span title="A date or partial date (e.g. just year or year + month). There is no time zone. The format
             is a union of the schema types gYear, gYearMonth and date.  Dates SHALL be valid dates.">timingDate</span> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px"/> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px"/> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
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            <a href="datatypes.html#date">date</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px"/> 
        </tr> 

        <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white;">
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            <span title="A date, date-time or partial date (e.g. just year or year + month).  If hours and minutes
             are specified, a time zone SHALL be populated. The format is a union of the schema types
             gYear, gYearMonth, date and dateTime. Seconds must be provided due to schema type constraints
             but may be zero-filled and may be ignored.                 Dates SHALL be valid dates.">timingDateTime</span> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px"/> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px"/> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
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            <a href="datatypes.html#dateTime">dateTime</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px"/> 
        </tr> 

        <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white;">
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            FgY9loiRA4dToTYnsOxg8CBGHE6ICvEYQ4AKzkidfgoKBAA7" style="background-color: white; background-color: inherit" title="Data Type"/>  
            <a href="metadatatypes-definitions.html#TriggerDefinition.data" title="TriggerDefinition.data : The triggering data of the event (if this is a data trigger).">data</a> 
            <a name="TriggerDefinition.data"> </a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; background-color: white" title="This element is included in summaries">Σ</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">0..1</td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="metadatatypes.html#DataRequirement">DataRequirement</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">Triggering data of the event</td> 
        </tr> 

        <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white;">
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
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            <a href="metadatatypes-definitions.html#TriggerDefinition.condition" title="TriggerDefinition.condition : A boolean-valued expression that is evaluated in the context
             of the container of the trigger definition and returns whether or not the trigger fires.">condition</a> 
            <a name="TriggerDefinition.condition"> </a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; background-color: white" title="This element is included in summaries">Σ</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">0..1</td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="element.html">Element</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">Whether the event triggers</td> 
        </tr> 

        <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white;">
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
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            <img alt="." class="hierarchy" src="data: image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABmJLR0QA/wD/AP+gvaeTAAAACXBIW
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            <a href="metadatatypes-definitions.html#TriggerDefinition.condition.description" title="TriggerDefinition.condition.description : A brief, natural language description of the
             condition that effectively communicates the intended semantics.">description</a> 
            <a name="TriggerDefinition.condition.description"> </a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; background-color: white" title="This element is included in summaries">Σ</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">0..1</td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="datatypes.html#string">string</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">Natural language description of the condition</td> 
        </tr> 

        <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white;">
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(data: image/png;base64,iVBORw0KG
          goAAAANSUhEUgAAAyAAAAACCAYAAACg/LjIAAAALElEQVR42u3QwQkAMAwDsezq/WdIO4XJQwa9DTdJpulv258AAMANIgAAADUPYA
          VAgAJ//usAAAAASUVORK5CYII=)">
            <img alt="." class="hierarchy" src="data: image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAWCAYAAAABxvaqAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB
            3RJTUUH3wYeFzIs1vtcMQAAAB1pVFh0Q29tbWVudAAAAAAAQ3JlYXRlZCB3aXRoIEdJTVBkLmUHAAAAE0lEQVQI12P4//8/AxMDAw
            NdCABMPwMo2ctnoQAAAABJRU5ErkJggg==" style="background-color: inherit"/> 
            <img alt="." class="hierarchy" src="data: image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAWCAYAAADJqhx8AAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB
            3RJTUUH3wYeFzIZgEiYEgAAAB1pVFh0Q29tbWVudAAAAAAAQ3JlYXRlZCB3aXRoIEdJTVBkLmUHAAAAIElEQVQ4y2P8//8/AyWAiY
            FCMGrAqAGjBowaMGoAAgAALL0DKYQ0DPIAAAAASUVORK5CYII=" style="background-color: inherit"/> 
            <img alt="." class="hierarchy" src="data: image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAWCAYAAADJqhx8AAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB
            3RJTUUH3wYeFzI3XJ6V3QAAAB1pVFh0Q29tbWVudAAAAAAAQ3JlYXRlZCB3aXRoIEdJTVBkLmUHAAAANklEQVQ4y+2RsQ0AIAzDav
            7/2VzQwoCY4iWbZSmo1QGoUgNMghvWaIejPQW/CrrNCylIwcOCDYfLNRcNer4SAAAAAElFTkSuQmCC" style="background-color: inherit"/> 
            <img alt="." class="hierarchy" src="data: image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABmJLR0QA/wD/AP+gvaeTAAAACXBIW
            XMAAAsTAAALEwEAmpwYAAAAB3RJTUUH3gYBFzI0BrFQCwAAAERJREFUOMtj/P//PwMlgImBQjDwBrCcOnWKokBgYWBgYDCU+06W5i
            8MUggvnH/EOVJjAW4AuQHJ+O75LYqikXE0LzAAALePEntTkEoSAAAAAElFTkSuQmCC" style="background-color: white; background-color: inherit" title="Primitive Data Type"/>  
            <a href="metadatatypes-definitions.html#TriggerDefinition.condition.language" title="TriggerDefinition.condition.language : The media type of the language for the expression.">language</a> 
            <a name="TriggerDefinition.condition.language"> </a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; background-color: white" title="This element is included in summaries">Σ</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">1..1</td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="datatypes.html#code">code</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">text/cql | text/fhirpath | etc.
            <br/>  
            <a href="valueset-expression-language.html" title="The media type of the expression language">ExpressionLanguage</a>  (
            <a href="terminologies.html#extensible" title="To be conformant, the concept in this element SHALL be from the specified value set if
             any of the codes within the value set can apply to the concept being communicated.  If
             the value set does not cover the concept (based on human review), alternate codings (or,
             data type allowing, text) may be included instead.">Extensible</a>  but limited to 
            <a href="http://www.rfc-editor.org/bcp/bcp13.txt">http://www.rfc-editor.org/bcp/bcp13.txt</a> )
          </td> 
        </tr> 

        <tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white;">
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(data: image/png;base64,iVBORw0KG
          goAAAANSUhEUgAAAyAAAAACCAYAAACg/LjIAAAAI0lEQVR42u3QIQEAAAACIL/6/4MvTAQOkLYBAAB4kAAAANwMad9AqkRjgNAAAA
          AASUVORK5CYII=)">
            <img alt="." class="hierarchy" src="data: image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAWCAYAAAABxvaqAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB
            3RJTUUH3wYeFzIs1vtcMQAAAB1pVFh0Q29tbWVudAAAAAAAQ3JlYXRlZCB3aXRoIEdJTVBkLmUHAAAAE0lEQVQI12P4//8/AxMDAw
            NdCABMPwMo2ctnoQAAAABJRU5ErkJggg==" style="background-color: inherit"/> 
            <img alt="." class="hierarchy" src="data: image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAWCAYAAADJqhx8AAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB
            3RJTUUH3wYeFzIZgEiYEgAAAB1pVFh0Q29tbWVudAAAAAAAQ3JlYXRlZCB3aXRoIEdJTVBkLmUHAAAAIElEQVQ4y2P8//8/AyWAiY
            FCMGrAqAGjBowaMGoAAgAALL0DKYQ0DPIAAAAASUVORK5CYII=" style="background-color: inherit"/> 
            <img alt="." class="hierarchy" src="data: image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAWCAYAAADJqhx8AAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB
            3RJTUUH3wYeFzME+lXFigAAAB1pVFh0Q29tbWVudAAAAAAAQ3JlYXRlZCB3aXRoIEdJTVBkLmUHAAAANklEQVQ4y+3OsRUAIAjEUO
            L+O8cJABttJM11/x1qZAGqRBEVcNIqdWj1efDqQbb3HwwwwEfABmQUHSPM9dtDAAAAAElFTkSuQmCC" style="background-color: inherit"/> 
            <img alt="." class="hierarchy" src="data: image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABmJLR0QA/wD/AP+gvaeTAAAACXBIW
            XMAAAsTAAALEwEAmpwYAAAAB3RJTUUH3gYBFzI0BrFQCwAAAERJREFUOMtj/P//PwMlgImBQjDwBrCcOnWKokBgYWBgYDCU+06W5i
            8MUggvnH/EOVJjAW4AuQHJ+O75LYqikXE0LzAAALePEntTkEoSAAAAAElFTkSuQmCC" style="background-color: white; background-color: inherit" title="Primitive Data Type"/>  
            <a href="metadatatypes-definitions.html#TriggerDefinition.condition.expression" title="TriggerDefinition.condition.expression : An expression that returns true or false, indicating
             whether or not the condition is satisfied.">expression</a> 
            <a name="TriggerDefinition.condition.expression"> </a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="elementdefinition-definitions.html#ElementDefinition.isSummary" style="padding-left: 3px; padding-right: 3px; color: black; background-color: white" title="This element is included in summaries">Σ</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">1..1</td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">
            <a href="datatypes.html#string">string</a> 
          </td> 
          <td class="hierarchy" style="vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid;
           padding:0px 4px 0px 4px">Boolean-valued expression</td> 
        </tr> 

        <tr> 
          <td class="hierarchy" colspan="5">
            <br/>  
            <a href="formats.html#table" title="Legend for this format">
              <img alt="doco" src="help16.png" style="background-color: inherit"/>  Documentation for this format
            </a> 
          </td> 
        </tr> 
      </table> 
    </div> 
  </text> 
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-ballot-status">
    <valueString value="Trial Use"/> 
  </extension> 
  <url value="http://hl7.org/fhir/StructureDefinition/TriggerDefinition"/> 
  <name value="TriggerDefinition"/> 
  <status value="draft"/> 
  <date value="2018-04-03T12:05:46+10:00"/> 
  <publisher value="HL7 FHIR Standard"/> 
  <contact> 
    <telecom> 
      <system value="url"/> 
      <value value="http://hl7.org/fhir"/> 
    </telecom> 
  </contact> 
  <description value="Base StructureDefinition for TriggerDefinition Type: A description of a triggering event.
   Triggering events can be named events, data events, or periodic, as determined by the
   type element."/> 
  <fhirVersion value="3.3.0"/> 
  <mapping> 
    <identity value="rim"/> 
    <uri value="http://hl7.org/v3"/> 
    <name value="RIM Mapping"/> 
  </mapping> 
  <kind value="complex-type"/> 
  <abstract value="false"/> 
  <type value="TriggerDefinition"/> 
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Element"/> 
  <derivation value="specialization"/> 
  <snapshot> 
    <element id="TriggerDefinition">
      <path value="TriggerDefinition"/> 
      <short value="Defines an expected trigger for a module"/> 
      <definition value="A description of a triggering event. Triggering events can be named events, data events,
       or periodic, as determined by the type element."/> 
      <comment value="If an event is a named-event, it means the event is completely pre-coordinated, and no
       other information can be specified for the event. If the event is one of the data- events,
       the data and condition elements specify the triggering criteria. The data element specifies
       the structured component, and the condition element provides additional optional refinement
       of that structured component. If the event is periodic, the timing element defines when
       the event is triggered. For both data- and periodic events, a name can be provided as
       a shorthand for the formal semantics provided by the other elements."/> 
      <min value="0"/> 
      <max value="*"/> 
      <base> 
        <path value="TriggerDefinition"/> 
        <min value="0"/> 
        <max value="*"/> 
      </base> 
      <condition value="ele-1"/> 
      <constraint> 
        <key value="ele-1"/> 
        <severity value="error"/> 
        <human value="All FHIR elements must have a @value or children"/> 
        <expression value="hasValue() | (children().count() &gt; id.count())"/> 
        <xpath value="@value|f:*|h:div"/> 
        <source value="Element"/> 
      </constraint> 
      <constraint> 
        <key value="trd-2"/> 
        <severity value="error"/> 
        <human value="A condition only if there is a data requirement"/> 
        <expression value="condition.exists() implies data.exists()"/> 
        <xpath value="not(exists(f:condition)) or exists(f:data)"/> 
      </constraint> 
      <constraint> 
        <key value="trd-1"/> 
        <severity value="error"/> 
        <human value="Either timing, or a data requirement, but not both"/> 
        <expression value="data.empty() or timing.empty()"/> 
        <xpath value="not(exists(f:data)) or not(exists(*[starts-with(local-name(.), 'timing')]))"/> 
      </constraint> 
      <isModifier value="false"/> 
      <mapping> 
        <identity value="rim"/> 
        <map value="n/a"/> 
      </mapping> 
    </element> 
    <element id="TriggerDefinition.id">
      <path value="TriggerDefinition.id"/> 
      <representation value="xmlAttr"/> 
      <short value="xml:id (or equivalent in JSON)"/> 
      <definition value="Unique id for the element within a resource (for internal references). This may be any
       string value that does not contain spaces."/> 
      <min value="0"/> 
      <max value="1"/> 
      <base> 
        <path value="Element.id"/> 
        <min value="0"/> 
        <max value="1"/> 
      </base> 
      <type> 
        <code value="string"/> 
      </type> 
      <isModifier value="false"/> 
      <isSummary value="false"/> 
      <mapping> 
        <identity value="rim"/> 
        <map value="n/a"/> 
      </mapping> 
    </element> 
    <element id="TriggerDefinition.extension">
      <path value="TriggerDefinition.extension"/> 
      <slicing> 
        <discriminator> 
          <type value="value"/> 
          <path value="url"/> 
        </discriminator> 
        <description value="Extensions are always sliced by (at least) url"/> 
        <rules value="open"/> 
      </slicing> 
      <short value="Additional content defined by implementations"/> 
      <definition value="May be used to represent additional information that is not part of the basic definition
       of the element. To make the use of extensions safe and manageable, there is a strict set
       of governance  applied to the definition and use of extensions. Though any implementer
       can define an extension, there is a set of requirements that SHALL be met as part of the
       definition of the extension."/> 
      <comment value="There can be no stigma associated with the use of extensions by any application, project,
       or standard - regardless of the institution or jurisdiction that uses or defines the extensions.
        The use of extensions is what allows the FHIR specification to retain a core level of
       simplicity for everyone."/> 
      <alias value="extensions"/> 
      <alias value="user content"/> 
      <min value="0"/> 
      <max value="*"/> 
      <base> 
        <path value="Element.extension"/> 
        <min value="0"/> 
        <max value="*"/> 
      </base> 
      <type> 
        <code value="Extension"/> 
      </type> 
      <isModifier value="false"/> 
      <isSummary value="false"/> 
      <mapping> 
        <identity value="rim"/> 
        <map value="n/a"/> 
      </mapping> 
    </element> 
    <element id="TriggerDefinition.type">
      <path value="TriggerDefinition.type"/> 
      <short value="named-event | periodic | data-changed | data-added | data-modified | data-removed | data-accessed
       | data-access-ended"/> 
      <definition value="The type of triggering event."/> 
      <min value="1"/> 
      <max value="1"/> 
      <base> 
        <path value="TriggerDefinition.type"/> 
        <min value="1"/> 
        <max value="1"/> 
      </base> 
      <type> 
        <code value="code"/> 
      </type> 
      <isModifier value="false"/> 
      <isSummary value="true"/> 
      <binding> 
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="TriggerType"/> 
        </extension> 
        <strength value="required"/> 
        <description value="The type of trigger"/> 
        <valueSetCanonical value="http://hl7.org/fhir/ValueSet/trigger-type"/> 
      </binding> 
    </element> 
    <element id="TriggerDefinition.name">
      <path value="TriggerDefinition.name"/> 
      <short value="Name or URI that identifies the event"/> 
      <definition value="A formal name for the event. This may be an absolute URI that identifies the event formally
       (e.g. from a trigger registry), or a simple relative URI that identifies the event in
       a local context."/> 
      <comment value="An event name can be provided for all event types, but is required for named events. If
       a name is provided for a type other than named events, it is considered to be a shorthand
       for the semantics described by the formal description of the event."/> 
      <min value="0"/> 
      <max value="1"/> 
      <base> 
        <path value="TriggerDefinition.name"/> 
        <min value="0"/> 
        <max value="1"/> 
      </base> 
      <type> 
        <code value="string"/> 
      </type> 
      <isModifier value="false"/> 
      <isSummary value="true"/> 
    </element> 
    <element id="TriggerDefinition.timing[x]">
      <path value="TriggerDefinition.timing[x]"/> 
      <short value="Timing of the event"/> 
      <definition value="The timing of the event (if this is a periodic trigger)."/> 
      <min value="0"/> 
      <max value="1"/> 
      <base> 
        <path value="TriggerDefinition.timing[x]"/> 
        <min value="0"/> 
        <max value="1"/> 
      </base> 
      <type> 
        <code value="Timing"/> 
      </type> 
      <type> 
        <code value="Reference"/> 
        <targetProfile value="http://hl7.org/fhir/StructureDefinition/Schedule"/> 
      </type> 
      <type> 
        <code value="date"/> 
      </type> 
      <type> 
        <code value="dateTime"/> 
      </type> 
      <isModifier value="false"/> 
      <isSummary value="true"/> 
    </element> 
    <element id="TriggerDefinition.data">
      <path value="TriggerDefinition.data"/> 
      <short value="Triggering data of the event"/> 
      <definition value="The triggering data of the event (if this is a data trigger)."/> 
      <comment value="This element shall be present for any data type trigger."/> 
      <min value="0"/> 
      <max value="1"/> 
      <base> 
        <path value="TriggerDefinition.data"/> 
        <min value="0"/> 
        <max value="1"/> 
      </base> 
      <type> 
        <code value="DataRequirement"/> 
      </type> 
      <isModifier value="false"/> 
      <isSummary value="true"/> 
    </element> 
    <element id="TriggerDefinition.condition">
      <path value="TriggerDefinition.condition"/> 
      <short value="Whether the event triggers"/> 
      <definition value="A boolean-valued expression that is evaluated in the context of the container of the trigger
       definition and returns whether or not the trigger fires."/> 
      <comment value="This element can be only be specified for data type triggers and provides additional semantics
       for the trigger. The context available within the condition is based on the type of data
       event. For all events, the current resource will be available as context. In addition,
       for modification events, the previous resource will also be available."/> 
      <requirements value="Need to be able to formally describe the triggering criteria."/> 
      <min value="0"/> 
      <max value="1"/> 
      <base> 
        <path value="TriggerDefinition.condition"/> 
        <min value="0"/> 
        <max value="1"/> 
      </base> 
      <type> 
        <code value="Element"/> 
      </type> 
      <constraint> 
        <key value="ele-1"/> 
        <severity value="error"/> 
        <human value="All FHIR elements must have a @value or children"/> 
        <expression value="hasValue() | (children().count() &gt; id.count())"/> 
        <xpath value="@value|f:*|h:div"/> 
        <source value="Element"/> 
      </constraint> 
      <isModifier value="false"/> 
      <isSummary value="true"/> 
    </element> 
    <element id="TriggerDefinition.condition.id">
      <path value="TriggerDefinition.condition.id"/> 
      <representation value="xmlAttr"/> 
      <short value="xml:id (or equivalent in JSON)"/> 
      <definition value="Unique id for the element within a resource (for internal references). This may be any
       string value that does not contain spaces."/> 
      <min value="0"/> 
      <max value="1"/> 
      <base> 
        <path value="Element.id"/> 
        <min value="0"/> 
        <max value="1"/> 
      </base> 
      <type> 
        <code value="string"/> 
      </type> 
      <isModifier value="false"/> 
      <isSummary value="false"/> 
      <mapping> 
        <identity value="rim"/> 
        <map value="n/a"/> 
      </mapping> 
    </element> 
    <element id="TriggerDefinition.condition.extension">
      <path value="TriggerDefinition.condition.extension"/> 
      <slicing> 
        <discriminator> 
          <type value="value"/> 
          <path value="url"/> 
        </discriminator> 
        <description value="Extensions are always sliced by (at least) url"/> 
        <rules value="open"/> 
      </slicing> 
      <short value="Additional content defined by implementations"/> 
      <definition value="May be used to represent additional information that is not part of the basic definition
       of the element. To make the use of extensions safe and manageable, there is a strict set
       of governance  applied to the definition and use of extensions. Though any implementer
       can define an extension, there is a set of requirements that SHALL be met as part of the
       definition of the extension."/> 
      <comment value="There can be no stigma associated with the use of extensions by any application, project,
       or standard - regardless of the institution or jurisdiction that uses or defines the extensions.
        The use of extensions is what allows the FHIR specification to retain a core level of
       simplicity for everyone."/> 
      <alias value="extensions"/> 
      <alias value="user content"/> 
      <min value="0"/> 
      <max value="*"/> 
      <base> 
        <path value="Element.extension"/> 
        <min value="0"/> 
        <max value="*"/> 
      </base> 
      <type> 
        <code value="Extension"/> 
      </type> 
      <isModifier value="false"/> 
      <isSummary value="false"/> 
      <mapping> 
        <identity value="rim"/> 
        <map value="n/a"/> 
      </mapping> 
    </element> 
    <element id="TriggerDefinition.condition.description">
      <path value="TriggerDefinition.condition.description"/> 
      <short value="Natural language description of the condition"/> 
      <definition value="A brief, natural language description of the condition that effectively communicates the
       intended semantics."/> 
      <min value="0"/> 
      <max value="1"/> 
      <base> 
        <path value="TriggerDefinition.condition.description"/> 
        <min value="0"/> 
        <max value="1"/> 
      </base> 
      <type> 
        <code value="string"/> 
      </type> 
      <isModifier value="false"/> 
      <isSummary value="true"/> 
    </element> 
    <element id="TriggerDefinition.condition.language">
      <path value="TriggerDefinition.condition.language"/> 
      <short value="text/cql | text/fhirpath | etc."/> 
      <definition value="The media type of the language for the expression."/> 
      <min value="1"/> 
      <max value="1"/> 
      <base> 
        <path value="TriggerDefinition.condition.language"/> 
        <min value="1"/> 
        <max value="1"/> 
      </base> 
      <type> 
        <code value="code"/> 
      </type> 
      <isModifier value="false"/> 
      <isSummary value="true"/> 
      <binding> 
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-maxValueSet">
          <valueReference> 
            <reference value="http://www.rfc-editor.org/bcp/bcp13.txt"/> 
          </valueReference> 
        </extension> 
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="ExpressionLanguage"/> 
        </extension> 
        <strength value="extensible"/> 
        <description value="The media type of the expression language"/> 
        <valueSetCanonical value="http://hl7.org/fhir/ValueSet/expression-language"/> 
      </binding> 
    </element> 
    <element id="TriggerDefinition.condition.expression">
      <path value="TriggerDefinition.condition.expression"/> 
      <short value="Boolean-valued expression"/> 
      <definition value="An expression that returns true or false, indicating whether or not the condition is satisfied."/> 
      <comment value="The expression may be inlined, or may be a simple absolute URI, which is a reference to
       a named expression within a logic library referenced by a library element or extension
       within the containing resource. If the expression is a FHIR Path expression, it evaluates
       in the context of a resource of one of the type identified in the data requirement, and
       may also refer to the variable %previous for delta comparisons on events of type data-changed,
       data-modified, and data-deleted which will always have the same type."/> 
      <min value="1"/> 
      <max value="1"/> 
      <base> 
        <path value="TriggerDefinition.condition.expression"/> 
        <min value="1"/> 
        <max value="1"/> 
      </base> 
      <type> 
        <code value="string"/> 
      </type> 
      <isModifier value="false"/> 
      <isSummary value="true"/> 
    </element> 
  </snapshot> 
  <differential> 
    <element id="TriggerDefinition">
      <path value="TriggerDefinition"/> 
      <short value="Defines an expected trigger for a module"/> 
      <definition value="A description of a triggering event. Triggering events can be named events, data events,
       or periodic, as determined by the type element."/> 
      <comment value="If an event is a named-event, it means the event is completely pre-coordinated, and no
       other information can be specified for the event. If the event is one of the data- events,
       the data and condition elements specify the triggering criteria. The data element specifies
       the structured component, and the condition element provides additional optional refinement
       of that structured component. If the event is periodic, the timing element defines when
       the event is triggered. For both data- and periodic events, a name can be provided as
       a shorthand for the formal semantics provided by the other elements."/> 
      <min value="0"/> 
      <max value="*"/> 
      <constraint> 
        <key value="trd-2"/> 
        <severity value="error"/> 
        <human value="A condition only if there is a data requirement"/> 
        <expression value="condition.exists() implies data.exists()"/> 
        <xpath value="not(exists(f:condition)) or exists(f:data)"/> 
      </constraint> 
      <constraint> 
        <key value="trd-1"/> 
        <severity value="error"/> 
        <human value="Either timing, or a data requirement, but not both"/> 
        <expression value="data.empty() or timing.empty()"/> 
        <xpath value="not(exists(f:data)) or not(exists(*[starts-with(local-name(.), 'timing')]))"/> 
      </constraint> 
    </element> 
    <element id="TriggerDefinition.type">
      <path value="TriggerDefinition.type"/> 
      <short value="named-event | periodic | data-changed | data-added | data-modified | data-removed | data-accessed
       | data-access-ended"/> 
      <definition value="The type of triggering event."/> 
      <min value="1"/> 
      <max value="1"/> 
      <type> 
        <code value="code"/> 
      </type> 
      <isSummary value="true"/> 
      <binding> 
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="TriggerType"/> 
        </extension> 
        <strength value="required"/> 
        <description value="The type of trigger"/> 
        <valueSetCanonical value="http://hl7.org/fhir/ValueSet/trigger-type"/> 
      </binding> 
    </element> 
    <element id="TriggerDefinition.name">
      <path value="TriggerDefinition.name"/> 
      <short value="Name or URI that identifies the event"/> 
      <definition value="A formal name for the event. This may be an absolute URI that identifies the event formally
       (e.g. from a trigger registry), or a simple relative URI that identifies the event in
       a local context."/> 
      <comment value="An event name can be provided for all event types, but is required for named events. If
       a name is provided for a type other than named events, it is considered to be a shorthand
       for the semantics described by the formal description of the event."/> 
      <min value="0"/> 
      <max value="1"/> 
      <type> 
        <code value="string"/> 
      </type> 
      <isSummary value="true"/> 
    </element> 
    <element id="TriggerDefinition.timing[x]">
      <path value="TriggerDefinition.timing[x]"/> 
      <short value="Timing of the event"/> 
      <definition value="The timing of the event (if this is a periodic trigger)."/> 
      <min value="0"/> 
      <max value="1"/> 
      <type> 
        <code value="Timing"/> 
      </type> 
      <type> 
        <code value="Reference"/> 
        <targetProfile value="http://hl7.org/fhir/StructureDefinition/Schedule"/> 
      </type> 
      <type> 
        <code value="date"/> 
      </type> 
      <type> 
        <code value="dateTime"/> 
      </type> 
      <isSummary value="true"/> 
    </element> 
    <element id="TriggerDefinition.data">
      <path value="TriggerDefinition.data"/> 
      <short value="Triggering data of the event"/> 
      <definition value="The triggering data of the event (if this is a data trigger)."/> 
      <comment value="This element shall be present for any data type trigger."/> 
      <min value="0"/> 
      <max value="1"/> 
      <type> 
        <code value="DataRequirement"/> 
      </type> 
      <isSummary value="true"/> 
    </element> 
    <element id="TriggerDefinition.condition">
      <path value="TriggerDefinition.condition"/> 
      <short value="Whether the event triggers"/> 
      <definition value="A boolean-valued expression that is evaluated in the context of the container of the trigger
       definition and returns whether or not the trigger fires."/> 
      <comment value="This element can be only be specified for data type triggers and provides additional semantics
       for the trigger. The context available within the condition is based on the type of data
       event. For all events, the current resource will be available as context. In addition,
       for modification events, the previous resource will also be available."/> 
      <requirements value="Need to be able to formally describe the triggering criteria."/> 
      <min value="0"/> 
      <max value="1"/> 
      <type> 
        <code value="Element"/> 
      </type> 
      <isSummary value="true"/> 
    </element> 
    <element id="TriggerDefinition.condition.description">
      <path value="TriggerDefinition.condition.description"/> 
      <short value="Natural language description of the condition"/> 
      <definition value="A brief, natural language description of the condition that effectively communicates the
       intended semantics."/> 
      <min value="0"/> 
      <max value="1"/> 
      <type> 
        <code value="string"/> 
      </type> 
      <isSummary value="true"/> 
    </element> 
    <element id="TriggerDefinition.condition.language">
      <path value="TriggerDefinition.condition.language"/> 
      <short value="text/cql | text/fhirpath | etc."/> 
      <definition value="The media type of the language for the expression."/> 
      <min value="1"/> 
      <max value="1"/> 
      <type> 
        <code value="code"/> 
      </type> 
      <isSummary value="true"/> 
      <binding> 
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-maxValueSet">
          <valueReference> 
            <reference value="http://www.rfc-editor.org/bcp/bcp13.txt"/> 
          </valueReference> 
        </extension> 
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="ExpressionLanguage"/> 
        </extension> 
        <strength value="extensible"/> 
        <description value="The media type of the expression language"/> 
        <valueSetCanonical value="http://hl7.org/fhir/ValueSet/expression-language"/> 
      </binding> 
    </element> 
    <element id="TriggerDefinition.condition.expression">
      <path value="TriggerDefinition.condition.expression"/> 
      <short value="Boolean-valued expression"/> 
      <definition value="An expression that returns true or false, indicating whether or not the condition is satisfied."/> 
      <comment value="The expression may be inlined, or may be a simple absolute URI, which is a reference to
       a named expression within a logic library referenced by a library element or extension
       within the containing resource. If the expression is a FHIR Path expression, it evaluates
       in the context of a resource of one of the type identified in the data requirement, and
       may also refer to the variable %previous for delta comparisons on events of type data-changed,
       data-modified, and data-deleted which will always have the same type."/> 
      <min value="1"/> 
      <max value="1"/> 
      <type> 
        <code value="string"/> 
      </type> 
      <isSummary value="true"/> 
    </element> 
  </differential> 
</StructureDefinition> 

Usage note: every effort has been made to ensure that the examples are correct and useful, but they are not a normative part of the specification.